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Angled shots onto body armour using 9 mm ammunition: the effect on potential blunt injury.

Lyall, Alison; Carr, D J; Lankester, C; Malbon, C.
J R Army Med Corps; 163(1): 35-38, 2017 Feb.
Artigo em Inglês | MEDLINE | 2017 | ID: mdl-26937022
Resumo: INTRODUCTION: Some military specialists wear body armour that is more similar to police armour and provides protection from ammunition fired from pistols. During ballistic testing, these armours are mounted on a standardised type of modelling clay and the back face signature (BFS; depth of depression) formed as a result of the non-perforating impact event on to the armour is measured. This study investigated the effect of impact angle on the BFS and on the deformation of the bullet. METHODS: Two commonly worn types of armour (HG1/A+KR1 and HG1+KR1) were considered that provide protection from pistol ammunition and sharp weapons. Armours were tested against two types of pistol ammunition (9 mm full metal jacket and 9 mm hollow point) at eight different impact angles (0°, 15°, 30°, 45°, 60°, 70°, 75° and 80°). RESULTS: Increased impact angles resulted in smaller BFSs. Impact angle also affected whether bullets were retained in the armour; as the impact angle increased, the probability of a round exiting the side of the armour increased. Bullet deformation was affected by impact angle. CONCLUSIONS: Understanding the deformation of bullets may assist with recreating a shooting incident and interpreting forensic evidence.